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LA-UR-06-6206

MCNPX Overview

G. W. McKinney J. W. Durkee, J. S. Hendricks, M. R. James, D. B. Pelowitz, L. S. Waters

Los Alamos National Laboratory Los Alamos, NM

F. X. Gallmeier

Oak Ridge National Laboratory Oak Ridge, TN

HSSW, FNAL, September 6-8, 2006

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Outline

· MCNPX Summary and Development History · User Base, Web Site, Development Philosophy · Physics and Capability Details · Select 2.5.0 Features · Future Development

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

MCNPX Summary

· Monte Carlo radiation transport code

­ ­ ­ ­ Extends MCNP 4C to virtually all particles and energies 34 particle types (n,p,e,5 Leptons,11 Baryons,11 Mesons, 4 LI) Continuous energy (roughly 0-100 GeV) Data libraries below ~ 150 MeV (n,p,e,h) and models otherwise

· General 3-D geometry

­ 1st & 2nd degree surfaces, tori, 10 macrobodies, lattices

· General sources and tallies

­ Interdependent source variables, 7 tally types, many modifiers

· Supported on virtually all computer platforms

­ Unix, Linux, Windows, OS X (parallel with PVM or MPI)

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

2/0 0-M

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Ma c Un rob o r Su eso dies pe lve rim d R po es se on a d W nce W Me s sh

Development History

· MCNP & LAHET Merger Project 1995 · Version 2.1.5 November 14, 1999

­ HISTP/HTAPE3X, Mesh & radiography tallies, CEM

· Version 2.3.0

­ Proton libraries

April 27, 2002 August 1, 2002 March 21, 2005

· Version 2.4.0 · Version 2.5.0

­ Twenty-eight features

­ Update to MCNP 4C, Fortran 90, Windows PC support

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Development History

· Version 2.6.A 2005 · Version 2.6.B 2006 December 5,

­ Eigenfunction convergence, Burnup, Long file names

June 1,

­ CEM 03, Updated PHTLIB, Burnup predictorcorrector

· Version 2.6.C 2006

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

~November,

­ Activation n+, Spherical WW, Photon tally tagging

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26D

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Outline

· MCNPX Summary and Development History · User Base, Web Site, Development Philosophy · Physics and Capability Details · Select 2.5.0 Features · Future Development

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

User Base

· ~2500 users world wide

­ Provide 6-8 workshops per year (4-6 US, ~2 international) ­ 150 workshop participants per year ­ Access to RSICC/NEA released versions only

· http://rsicc.ornl.gov

­ Limited access to MCNPX web site

· http://mcnpx.lanl.gov (some documentation)

· ~2000 registered Beta Testers

­ Full access to MCNPX web site ­ Access to intermediate versions ­ Increased user support

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Application Medical (BNCT, proton therapy, etc.) Spacecraft, Cosmic Rays, SEE, propulsion Detectors, experiments, Threat Reduction Accelerator Shielding and Health Physics Fuel cycles, beginning to end, including storage ATW, ADS, Energy Amplifiers Theoretical Physics Neutron Production for Scattering Isotope Production Radiography MCNPX/MCNP code development Materials studies (IFMIF) Radioactive Ion Beams Irradiation Facilities Neutrino Targets Light by the Los Alamoselectron machines Sources, National Security, LLC for the DOE/NNSA Operated

# Groups 63 56 55 43 40 38 25 23 14 14 12 6 5 5 4 3

Percent 16 14 14 11 10 9 6 6 3 3 3 1 1 1 1 1

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Development Philosophy

· Quality

­ Active Beta Testers (~2000) ­ Bug rewards ($4 for old bugs, $20 new bugs) ­ Extensive test suite (~300 problems, ~75% coverage)

· Value

­ Thorough documentation (manual, web site) ­ Users forum ­ Three levels of workshops (intro, intermediate, advanced)

· Features

­ Beta release ~3 months ­ Public release ~2 years ­ Average ~1 feature/month

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Outline

· MCNPX Summary and Development History · User Base, Web Site, Development Philosophy · Physics and Capability Details · Select 2.5.0 Features · Future Development

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

General

Version Lab. Affiliation

MCNPX

2.5.0 LANL

GEANT4

8.0 p1 CERN IN2P3 INFN KEK SLAC TRIUMF ESA C++ Free Source & binary 280 pages ~2000 cern.ch/geant4 ~4/year C++ main Fixed geometry N/A Yes

FLUKA

2005 CERN INFN 15

MARS

FNAL

PHITS

2.09 JAEA RIST GSI Chalmers Univ.

Language Cost Release Format User Manual Users Web Site Workshops Input Format Input Cards Parallel Execution

Fortran 90/C Free Source & binary 470 pages 2500 mcnpx.lanl.gov ~7/year Free ~120 Yes

Fortran 77 Free Source & binary 387 pages ~1000 www.fluka.org ~1/year Fixed or free ~85 Yes

Fortran 95/C Free Binary 150 pages 220 www-ap.fnal. gov/MARS ~2/year Free ~100 Yes

Fortran 77 Free Source & binary 176 pages 220 Under const. ~1/year Free ~100 Yes

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Geometry

Description

MCNPX

MCNP-based

GEANT4

STEP Solids (Boolean CSG)

FLUKA

MORSE-based

MARS

Solids MCNP-based User defined No Yes Yes Yes Yes Built-in: 2-D Interactive Tcl/Tl 3-D Interactive OpenGL External: Custom

PHITS

MCNP-based MORSE-based

Extensions Twisted Nested Repeated Voxel Reflections Viewer Debugger

No Yes (universes) Yes Lattice (rec, hex) 3 types Built-in: 2-D Interactive X-Windows External: Vised Moritz

Yes Yes (logical vol.) Yes Yes (rec, cyl) Yes Built-in: 3-D Interactive OpenGL OpenInventor RayTracer External: WIRED VRML DAWN GGE STEP Yes Yes

No No Yes Yes Yes Built-in: None External: Custom (X11) Others?

No Yes (universes) Yes Lattice (rec, hex) Neutron albedo Built-in: 2,3-D Command PS via Angel External: Angel PS

Setup GUI CAD Fields (E/B) Moving

Vised Moritz STEP via GUI 2.6.0 2.6.0

No No Yes Yes

Tcl/Tl No Yes No

No No Yes Yes

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Source

Fixed General Explicit Distribution Dep. Dist. External User Sub. Eigenvalue Burnup

MCNPX

GEANT4

FLUKA

MARS

PHITS

Yes Yes Yes SSW/SSR Yes Yes Yes (2.6.A)

Yes Yes GPS Yes Yes No No

Yes No No No Yes No No

Yes Yes Yes Yes Yes No No

Yes Yes Yes Yes Yes No No

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Physics

Particles Charged particles Energy loss Scatter Straggling XTR/Cherenkov Baryons Neutron Low High Proton Low High Other 34

MCNPX

68 CSDA Bethe-Bloch Rossi Vavilov No

GEANT4

68 CSDA Bethe-Bloch Lewis Urban Yes

FLUKA

41 CSDA Bethe-Bloch Moliere Custom No/yes

MARS

38 CSDA Bethe-Bloch Moliere* Custom No

PHITS

CSDA Bethe-Bloch Moliere Vavilov No

Cont. (ENDF) Models Cont. (ENDF) Models Model List: Bertini ISABEL CEM INCL FLUKA89>3 GeV LAQGSM (2.6.D) ITS 3.0 CSDA/decay Production Decay

Cont. (ENDF) Models Models Models Model list: Hadron-nucleous GHEISHA* INUCL(Bertini) BIC CHIPS QGS/FTF>8 GeV EEDL, EADL Models Production Decay

Multigroup(72) Models Models Models Model list: PEANUT(GINC) DPM+Glauber > 5 GeV

Cont. (ENDF) Models Models Models Model list: Custom CEM LAQGSM DPMJET

Cont. (ENDF) Models Models Models Model list: Bertini JAM>3 GeV

Leptons Electrons Muon Neutrino Other

Custom Models Models Decay

Custom Models Models Models

ITS 3.0 CSDA/decay Models Models

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Physics

Mesons Photons Optical x-ray/ Photonuclear Ions

MCNPX

Models No ITS 3.0 Libraries (IAEA) CEM ISABEL LAQGSM (2.6.D) n, (2.6.C)

GEANT4

Models Yes EPDL97, EADL CHIPS AAM EDM BLIC ,,

FLUKA

Models Yes Custom+EPDL97 PEANUT VMDM RQMD-2.4 DPMJET-3 ,

MARS

Models No Custom Custom CEM LAQGSM

PHITS

Models No ITS 3.0 No JQMD JAMQMD > 3 GeV/u n

Delayed

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Tallies

Standard Flux Volume Surface Point/ring Current Charge Kinetic energy Particle density Reaction rates Energy deposition Rapidity DPA Momentum Pulse-height Termination Modifiers Special Mesh Coincidence Residuals Activation Event logs Convergence Tests

MCNPX

GEANT4

FLUKA

MARS

PHITS

Yes Yes Yes Yes Yes Yes Yes Yes Yes No HTAPE3X No Yes Partial 9 rec, cyl, sph Yes Yes 2.5.D Yes 10

Yes Limited No Limited Yes Yes Yes No Yes Yes ?? Yes User input ?? 2 rec, cyl No No ?? Yes Error

Yes Yes No Yes Yes Yes No Star (inelastic) Yes Yes Some Yes Yes Yes 2 rec, cyl Yes Yes Yes Yes Error

Yes Yes Yes (neutrons) Yes Yes Yes No Yes Yes Yes. Yes Yes No Partial 2 rec, cyl, sph Yes Yes Yes Yes Error

Yes Yes No Yes Yes Yes No Yes Yes No Yes No Yes Yes 2 rec,cyl Yes Yes No Yes Error

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Tallies

Viewer

MCNPX

Built-in: 1-D, 2-D Custom X-Windows External: IDL Tecplot GNUplot PAW

GEANT4

Built-in: No External: JAS PI Open Scientist

FLUKA

Built-in: None External: Custom (X11) GNUplot PAW ROOT

MARS

Built-in: Custom External: PAW

PHITS

Built-in: Angel External: Angel

Variance Reduction

Population control Region biasing Weight cutoff Weight window mesh Energy biasing Modified sampling Source biasing Implicit capture Exp. transform Production biasing Angular bias DXTRAN Viewer Yes Yes Yes Yes Yes Yes Yes Yes Via DXTRAN Yes 2-D contour Yes Yes Yes No RDM Yes No Yes ?? No No Yes Yes Yes Yes Yes Yes Yes Yes Yes No No Yes Yes Yes Yes Yes Yes Yes Yes Yes No No Yes Yes Yes Yes Yes Yes No Yes Yes No No

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Outline

· MCNPX Summary and Development History · User Base, Web Site, Development Philosophy · Physics and Capability Details · Select 2.5.0 Features · Future Development

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Select 2.5.0 Features

· User-interface enhancements (15)

­ ­ ­ ­ 5 new source options 4 new tally options 3 new graphics options 3 other miscellaneous improvements

· Physics enhancements (9)

­ 4 new model physics features ­ 2 new neutron physics features ­ 3 new photon physics features

· Infrastructure enhancements (4)

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

User-Interface Enhancements

· Five new source options

­ ­ ­ ­ ­ Positron sources Spontaneous fission sources Multiple source particles Default VEC for cylindrical sources Extension of the TR keyword

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Multiple Source Particles / TR Extension

Distribution for PAR and TR Keywords 1 0 -1 imp:n=1 2 0 1 imp:n=0 1 SPH 0 0 0 100 mode n p sdef par=d1 erg=fpar=d2 tr=fpar=d3 x=d4 y=d5 z=0 cell=1 si1 L n p sp1 1 1 ds2 L 1.0 2.0 ds3 L 1 2 si4 -50 50 sp4 0 1 si5 -50 50 sp5 0 1 tr1 -50 50 0 tr2 50 -50 0 nps 10000 tmesh rmesh2 n p cora2 -100 99i 100 corb2 -100 99i 100 corc2 -1 1 endmd

1.0 MeV Neutrons

2.0 MeV Photons

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User-Interface Enhancements

· Four new tally options

­ ­ ­ ­ Lattice tally speedup Anticoincidence pulse-height tally Coincidence capture pulse-height tally Residual nuclei pulse-height tally

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Anticoincidence Pulse-Height Tally

Anticoincidence PHT 1 1 -7.130 -1 2 2 -1.032 1 -2 3 3 0 1 -2 -3 4 0 2 1 MeV Photons => Plastic/BGO imp:p=1 imp:p=1 imp:p=1 imp:p=0

1 SPH 0 0 0 5.0 2 SPH 0 0 0 6.0 3 RCC -7 0 0 4 0 0 3.0 mode p e sdef sur=2 nrm=-1 par=p erg=1.0 nps 100000 m1 83000 -0.671 32000 -0.175 8000 -0.154 m2 6000 -0.9153 1000 -0.0847 f26:e 2 $ Plastic energy dep. ft26 GEB 0 0.1098 0 sd26 1 f36:e 1 $ BGO energy dep. ft36 GEB 0 0.1098 0 sd36 1 f18:e 1 $ Plastic/BGO PHT e18 0. 1.0 fu18 0. 99i 1.0 ft18 phl 1 26 1 1 36 1 fq18 u e

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Anticoincidence Pulse-Height Tally

1tally + 18 nps = 100000 ACS/BGO Pulse Height Response - all particles tally type 8 pulse height distribution. units number particle(s): photon electron this tally is modified by ft phl

cell

1 energy: user bin 0.0000E+00 1.0000E-02 2.0000E-02 3.0000E-02 4.0000E-02 5.0000E-02 6.0000E-02 7.0000E-02 8.0000E-02 9.0000E-02 1.0000E-01 1.1000E-01 1.2000E-01 1.3000E-01 1.4000E-01 1.5000E-01 1.6000E-01 1.7000E-01 1.8000E-01 . . .

0.0000E+00 1.30000E-04 6.80000E-04 7.90000E-04 6.90000E-04 8.70000E-04 7.80000E-04 8.40000E-04 9.30000E-04 7.60000E-04 8.00000E-04 9.20000E-04 9.80000E-04 8.60000E-04 8.70000E-04 9.30000E-04 9.30000E-04 8.40000E-04 9.50000E-04 1.08000E-03 0.2773 0.1212 0.1125 0.1203 0.1072 0.1132 0.1091 0.1036 0.1147 0.1118 0.1042 0.1010 0.1078 0.1072 0.1036 0.1036 0.1091 0.1025 0.0962

1.0000E+00 8.84300E-02 4.40000E-04 3.70000E-04 5.90000E-04 4.60000E-04 3.30000E-04 3.20000E-04 3.60000E-04 4.60000E-04 4.30000E-04 4.20000E-04 3.80000E-04 4.60000E-04 4.60000E-04 5.20000E-04 4.30000E-04 5.90000E-04 5.90000E-04 6.70000E-04 0.0102 0.1507 0.1644 0.1302 0.1474 0.1740 0.1767 0.1666 0.1474 0.1525 0.1543 0.1622 0.1474 0.1474 0.1386 0.1525 0.1302 0.1302 0.1221

total 8.85600E-02 1.12000E-03 1.16000E-03 1.28000E-03 1.33000E-03 1.11000E-03 1.16000E-03 1.29000E-03 1.22000E-03 1.23000E-03 1.34000E-03 1.36000E-03 1.32000E-03 1.33000E-03 1.45000E-03 1.36000E-03 1.43000E-03 1.54000E-03 1.75000E-03 0.0101 0.0944 0.0928 0.0883 0.0867 0.0949 0.0928 0.0880 0.0905 0.0901 0.0863 0.0857 0.0870 0.0867 0.0830 0.0857 0.0836 0.0805 0.0755

Plastic B G O

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Anticoincidence Pulse-Height Tally

Pulse-Height Tally

Accepted Spectrum

Rejected Spectrum

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Residual Nuclei Pulse-Height Tally

Residuals for 1.2 GeV Protons => Pb 1 1 -11. -1 imp:h 1 2 0 1 imp:h 0 1 so .01 mode h n sdef par h erg=1200 vec 0 0 1 dir 1 m1 82208 1 phys:h 1300 j 0 phys:n 1300 3j 0 nps 10000 f8:h 1 ft8 RES 1 99 lca 7j -2 0

All Isotopes

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Residual Nuclei Pulse-Height Tally

All Pb Isotopes

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User-Interface Enhancements

· Three new graphics options

­ Lattice index labeling ­ WWG superimposed mesh plots ­ Color contour and mesh tally plots

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WWG Superimposed Mesh Plots

Cylindrical WW Mesh-3 MeV Photons => H2O 1 1 1.0 -1 imp:p 1 2 0 1 imp:p 0 1 rcc 0 0 0 0 10 0 5 Cylindrical WW Mesh-3 MeV Photons => H2O 1 1 1.0 -1 imp:p 1 2 0 1 imp:p 0 1 rcc 0 0 0 0 10 0 5

mode p sdef sur=1.3 vec=0 1 0 dir=1 erg=3 m1 1001 2 8016 1 nps 1000000 f1:p 1.2 wwg 1 0 mesh geom=cyl origin=0 -1 0 ref=0 .1 0 axs=0 1 0 vec=1 0 0 imesh 6 iints 7 jmesh 12 jints 7 kmesh 1 kints 3

mode p sdef sur=1.3 vec=0 1 0 dir=1 erg=3 m1 1001 2 8016 1 nps 1000000 f1:p 1.2 wwg 1 0 mesh geom=cyl origin=0 -1 0 ref=0 .1 0 axs=0 1 0 vec=1 0 0 imesh 6 iints 14 jmesh 12 jints 14 kmesh 1 kints 6 wwp:p 4j -1

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Color Contour and Mesh Tally Plots

HEU Cans in a Hex Lattice 1 1 -8.4 -1 u=1 imp:n=1 2 0 -2 u=1 imp:n=1 3 2 -2.7 -3 1 2 u=1 imp:n=1 4 3 -.001 3 u=1 imp:n=1 10 3 -.001 -6 lat=2 u=2 imp:n=1 fill=-2:2 -2:2 0:0 2 2 2 2 2 2 2 1 1 2 2 1 1 1 2 2 1 1 2 2 2 2 2 2 2 11 0 -8 imp:n=1 fill=2 50 0 8 imp:n=0 1 2 3 6 8 rcc rcc rcc rhp rcc 0 0 0 0 0 0 12 -1 -1 -1 0 0 0 0 0 0 0 0 0 0 12 8 22 22 22 0 0 0 0 0 5 5 6 9 0 0 30

m1 1001 5.7058e-2 8016 3.2929e-2 92238 2.0909e-3 92235 1.0889e-4 m2 13027 1 m3 7014 .8 8016 .2 kcode 10000 1 10 40 ksrc 0 6 0 18 6 0 -18 6 0 9 6 15 -9 6 15 9 6 -15 -9 6 -15 tmesh rmesh12 cora12 -30. 53i 30. corb12 0. 12. corc12 -30. 35i 30. endmd

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Color Contour and Mesh Tally Plots

Aluminum Air HEU

~5% Enriched

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Color Contour and Mesh Tally Plots

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

User-Interface Enhancements

· Three other miscellaneous improvements

­ READ card ­ HISTP card extension ­ DXTRAN/Detector underflow control

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

User-Interface Enhancements

HEU Cans in a Hex Lattice READ FILE=cells NOECHO READ FILE=surfaces m1 1001 5.7058e-2 8016 3.2929e-2 92238 2.0909e-3 92235 1.0889e-4 m2 13027 1 m3 7014 .8 8016 .2 kcode 10000 1 10 40 ksrc 0 6 0 18 6 0 -18 6 0 9 6 15 -9 6 15 9 6 -15 -9 6 -15 tmesh rmesh12 cora12 -30. 53i 30. corb12 0. 12. corc12 -30. 35i 30. endmd File "cells" 1 1 -8.4 -1 u=1 imp:n=1 2 0 -2 u=1 imp:n=1 3 2 -2.7 -3 1 2 u=1 imp:n=1 4 3 -.001 3 u=1 imp:n=1 10 3 -.001 -6 lat=2 u=2 imp:n=1 fill=-2:2 -2:2 0:0 2 2 2 2 2 2 2 1 1 2 2 1 1 1 2 2 1 1 2 2 2 2 2 2 2 11 0 -8 imp:n=1 fill=2 50 0 8 imp:n=0

1 2 3 6 8

rcc rcc rcc rhp rcc

0 0 0 0 0

0 12 -1 -1 -1

0 0 0 0 0

0 0 0 0 0

File "surfaces" 12 0 5 8 0 5 22 0 6 22 0 9 0 0 22 0 30

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Physics Enhancements

· Four model physics improvements

­ ­ ­ ­ Mix & match of libraries and models CEM upgrade to version 2K INCL 4/ABLA physics models Secondary-particle production

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CEM Upgrade (versions 95, 2K, 03)

CEM for 1.2 GeV Protons => Pb 1 1 -11. -1 imp:h 1 2 0 1 imp:h 0 1 so 1.0 mode h n sdef par=h erg=1200 vec=1 0 0 dir=1 m1 82208 1 phys:h 1300 j 1 phys:n 1300 3j 1 nps 100000 lca 8j 1 f1:n 1 ft1 frv 1 0 0 *c1 175 34i 0 f11:n 1 e11 1. 30log 1200. f21:h 1 ft21 frv 1 0 0 *c21 175 34i 0 f31:h 1 e31 1. 30log 1200.

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CEM Upgrade (versions 95, 2K, 03)

Neutron Production 03 (2.6.C) 95 (2.4.0) 2K (2.5.0) 2K (2.5.0) 03 (2.6.C) Proton Production

95 (2.4.0)

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CEM Upgrade (versions 95, 2K, 03)

Neutron Production 03 (2.6.C) 95 (2.4.0) 2K (2.5.0) 03 (2.6.C) 95 (2.4.0) 2K (2.5.0)

Proton Production

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INCL 4/ABLA Physics Models

Various Physics Models for 1.2 GeV Protons => Pb 1 1 -11. -1 imp:h 1 2 0 1 imp:h 0 1 so .01 mode h n sdef par h erg=1200 vec 0 0 1 dir 1 m1 82208 1 phys:h 1300 j 0 phys:n 1300 3j 0 nps 100000 f1:n 1 ft1 frv 0 0 1 *c1 167.5 9i 17.5 0 T e1 1 50log 1300 LCA 7j -2 0 $ Bertini/Dresner LCA LEA LCA LCA LEA LCA LEA LCA LCA 7j 6J 2j 2j 6J 7j 6j 7j 7j -2 2 2 2 2 -2 2 -2 -2 0 $ Bertini/ABLA

4j -2 $ ISABEL/Dresner 4j -2 $ ISABEL/ABLA 2 2 1 $ INCL4/ABLA $ INCL4/Dresner $ CEM2K

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Secondary-Particle Production

Neutron Production

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Physics Enhancements

· Two neutron physics improvements

­ Fission multiplicity ­ S(,) secondary-energy smoothing

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Fission Multiplicity

Pu-239 Fission Multiplicity in H2O 1 1 -1.0 -1 imp:n=1 2 0 1 imp:n=0 1 SPH 0 0 0 100 sdef par=sf pos=0 0 0 rad=d1 axs=0 0 1 ext=0 si1 0 90 sp1 -21 1 m1 1001 2 8016 1 94239 1.e-4 phys:n 5j -1 nps 100000

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Fission Multiplicity

1spontaneous fission source multiplicity and moments. print table 117 --------- by number ---------------fission multiplicity fissions neutrons fraction nu nu nu nu nu nu nu nu = = = = = = = = 0 1 2 3 4 5 6 7 1232 3344 5134 3984 1627 345 38 1 15705 0 3344 10268 11952 6508 1725 228 7 34032 7.84464E-02 2.12926E-01 3.26902E-01 2.53677E-01 1.03598E-01 2.19675E-02 2.41961E-03 6.36740E-05 1.00000E+00 --------------- by weight ---------------------------fission multiplicity fissions neutrons fraction error 3.62012E-02 9.82605E-02 1.50858E-01 1.17066E-01 4.78079E-02 1.01375E-02 1.11660E-03 2.93841E-05 4.61477E-01 0.00000E+00 9.82605E-02 3.01716E-01 3.51199E-01 1.91232E-01 5.06876E-02 6.69958E-03 2.05689E-04 1.00000E+00 7.84464E-02 2.12926E-01 3.26902E-01 2.53677E-01 1.03598E-01 2.19675E-02 2.41961E-03 6.36740E-05 1.00000E+00 0.0280 0.0164 0.0129 0.0149 0.0242 0.0536 0.1621 1.0000 0.0059

total

factorial moments nu nu(nu-1)/2! nu(nu-1)(nu-2)/3! nu(nu-1) .... (nu-3)/4! nu(nu-1) .... (nu-4)/5! nu(nu-1) .... (nu-5)/6! nu(nu-1) .... (nu-6)/7!

by number 2.16695E+00 1.96683E+00 9.38364E-01 2.51958E-01 3.78223E-02 2.86533E-03 6.36740E-05 0.0044 0.0093 0.0176 0.0349 0.0777 0.2071 1.0000

by weight 2.16695E+00 1.96683E+00 9.38364E-01 2.51958E-01 3.78223E-02 2.86533E-03 6.36740E-05 0.0044 0.0093 0.0176 0.0349 0.0777 0.2071 1.0000

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Fission Multiplicity

1spontaneous and induced fission multiplicity and moments. print table 117 --------- by number ---------------fission multiplicity fissions neutrons fraction nu nu nu nu nu nu nu nu nu = = = = = = = = = 0 1 2 3 4 5 6 7 8 1499 4627 8169 7844 4200 1212 208 13 2 27774 0 4627 16338 23532 16800 6060 1248 91 16 68712 5.39713E-02 1.66595E-01 2.94124E-01 2.82422E-01 1.51221E-01 4.36379E-02 7.48902E-03 4.68064E-04 7.20098E-05 1.00000E+00 --------------- by weight ---------------------------fission multiplicity fissions neutrons fraction error 3.95528E-02 1.13595E-01 1.87902E-01 1.63875E-01 7.89230E-02 2.06316E-02 3.28351E-03 1.91773E-04 2.50905E-05 6.07979E-01 0.00000E+00 1.13595E-01 3.75804E-01 4.91624E-01 3.15692E-01 1.03158E-01 1.97011E-02 1.34241E-03 2.00724E-04 1.42112E+00 6.50562E-02 1.86840E-01 3.09060E-01 2.69540E-01 1.29812E-01 3.39348E-02 5.40070E-03 3.15428E-04 4.12687E-05 1.00000E+00 0.0261 0.0145 0.0105 0.0110 0.0162 0.0316 0.0762 0.2943 0.7174 0.0035

total

factorial moments nu nu(nu-1)/2! nu(nu-1)(nu-2)/3! nu(nu-1) .... (nu-3)/4! nu(nu-1) .... (nu-4)/5! nu(nu-1) .... (nu-5)/6! nu(nu-1) .... (nu-6)/7!

by number 2.47397E+00 2.60927E+00 1.49388E+00 5.03168E-01 1.02434E-01 1.27817E-02 1.04414E-03 0.0030 0.0064 0.0118 0.0226 0.0502 0.1382 0.4094

by weight 2.33744E+00 2.32469E+00 1.24950E+00 3.94425E-01 7.52740E-02 8.76422E-03 6.45578E-04 0.0034 0.0069 0.0124 0.0231 0.0492 0.1290 0.3940

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Physics Enhancements

· Three photon physics improvements

­ Photonuclear physics model ­ Photon Doppler broadening ­ Variance reduction with pulse-height tallies

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Photonuclear Physics Model

Photonuclear 10 MeV Photons => Pb 1 1 -7.86 -1 imp:n=1 2 0 1 imp:n=0 1 SPH 0 0 0 2 mode n p sdef par=p erg=10.0 phys:p 3j 1 m1 82208 1 c mx1:p model nps 1000000 f1:n 1 e1 1e-3 50log 10.

Photonuclear 10 MeV Photons => U-235 1 1 -7.86 -1 imp:n=1 2 0 1 imp:n=0 1 SPH 0 0 0 2 mode n p sdef par=p erg=10.0 phys:p 3j 1 m1 92235 1 xs1 92235.27u 233.024994 bofod01u 0 1 54868 2946 0 0 0.0 c mx1:p model nps 1000000 f1:n 1 e1 1e-3 50log 10.

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Photonuclear Physics Model

Neutron Production from Pb Model

Library

Operated by the Los Alamos National Security, LLC for the DOE/NNSA

Photonuclear Physics Model

Model

Library

Neutron Production from U-235

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Infrastructure Enhancements

· 8-byte integers

­ Users can now run billions of particles ­ Often required for parallel calculations ­ Runs about 20% slower on most systems

· Support for new compilers

­ Mac OS X with IBM compiler ­ Windows PC and Linux with Intel compiler

· Parallel processing with MPI

­ PVM option is still available

· MPI speedup for criticality problems

­ Eliminates collection of fission source after each cycle

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Outline

· MCNPX Summary and Development History · User Base, Web Site, Development Philosophy · Physics and Capability Details · Select 2.5.0 Features · Future Development

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Future Development

· MCNP 6 and MCNPX 2.6.B merger project

­ ­ ­ ­ ­ ­ ­ ­ Preserve all capabilities of both codes Complete merger within one year Release merged code as MCNP 6 or MCNP 7 MCNPX final version likely 2.6.0 Non-uniform electric and magnetic fields Coupling of secondary particles for library interactions Direct CAD links with spline surface tracking Enhanced visualization tools

· Features beyond version 2.6.0

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Information

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